Do NOT try to update the new fields from the migration. Takes too long on a live DB

Needs to be a separate task with no locking

db/migrate/20170330021336_add_counter_caches.rb

@@ -1,14 +1,9 @@
 class AddCounterCaches < ActiveRecord::Migration[5.0]
   def change
-  	add_column :statuses, :favourites_count, :integer
+    add_column :statuses, :favourites_count, :integer
-  	add_column :statuses, :reblogs_count, :integer
+    add_column :statuses, :reblogs_count, :integer
-
+    add_column :accounts, :statuses_count, :integer
-  	execute('update statuses set favourites_count = (select count(*) from favourites where favourites.status_id = statuses.id), reblogs_count = (select count(*) from statuses as reblogs where reblogs.reblog_of_id = statuses.id)')
+    add_column :accounts, :followers_count, :integer
-
+    add_column :accounts, :following_count, :integer
-  	add_column :accounts, :statuses_count, :integer
-  	add_column :accounts, :followers_count, :integer
-  	add_column :accounts, :following_count, :integer
-
-  	execute('update accounts set statuses_count = (select count(*) from statuses where account_id = accounts.id), followers_count = (select count(*) from follows where target_account_id = accounts.id), following_count = (select count(*) from follows where account_id = accounts.id)')
   end
 end